I seriously doubt this. Bitcoin is like "gold range" of value compared to other currencies. The value of other coins and tokens is defined by it and I am sure that this won't be changed in the near future.
I can guess it. Today, some people state that Ethereum will become the leader. It can be because of hundreds new ICO appearing everyday! Big money!
Maybe someday a currency will take over bitcoin, or rather outdated it, some bitcoin is at its lowest point now and continue to decrease ,but for now lets hope that the price of bitcoin will come back to its place, we just need some patience and develop some good thoughts about his, creating some speculations that includes the downfall of bitcoin will not help it anyway.